KDDI Mobile is a mobile phone

Mobile phone

A mobile phone is a device which can make and receive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile network operator...

 service operated in the United States. The brand was established under KDDI America — local branch of Japanese telecommunication company KDDI

KDDI

is a Japanese telecommunications operator formed in October 2000 through the merger of DDI Corp., KDD Corp., and IDO Corp. It has its headquarters in the Garden Air Tower in Iidabashi, Chiyoda, Tokyo....

 — to meet the needs of Japanese people living in the United States. The service operates on the Sprint

Sprint Nextel

Sprint Nextel Corporation is an American telecommunications company based in Overland Park, Kansas. The company owns and operates Sprint, the third largest wireless telecommunications network in the United States, with 53.4 million customers, behind Verizon Wireless and AT&T Mobility...

 network as a MVNO

Mobile virtual network operator

A mobile virtual network operator is a company that provides mobile phone services but does not have its own licensed frequency allocation of radio spectrum, nor does it necessarily have all of the infrastructure required to provide mobile telephone service...

. Initially targeting Japanese expatriates, they offer the Japanese-enabled KDDI Mobile 6600-J handset and their plan minutes include calls to Japan.